Lucille;
Looks like a white Majolica glaze. At the edges where it is thinner you can see the clay body. It looks porous, so I am thinking some kind of tin glaze-Delft? The on glaze decoration is cobalt for blue and vanadium pentoxide for yellow[either that or rutile].
What do I win?
TJR

It is a beauty. I would say majolica or a bristol glaze. Possibly delftware. It could be a hand warmer or a bed warmer. Bed warmers I have seen are usually just a bottle shape with a cork in the neck.
This may be better as a hand warmer then.

What do you suppose this can be? Can you tell what kind of glaze it is?

It looks like something you could dry a pair of gloves on, I remember my mom hanging gloves anywhere she could so we could go play in the snow again. There was five of us just imagine all of the gloves something you could heat up and lay the gloves on would have been very helpful. I don't have any different ideas than anyone else on the glaze. Denice

When I first saw this imagine, I knew I had seen it before but just couldn't remember where and when. It just came to me, it is a French hand warmer mid 17th century. The Met Museum has one in its collection.

Please don't think my memory is that good, I think I saw it on the british version of the road show.